Jurassic Park III probably counts. I read the novel last month and immediately recongnized that two scenes from the book were in the third movie, rather than the first one. I won’t be surprised if The Lost World material probably found its way into the movie as well.
Here’s a couple of obscure moments that could be defined as sequels:
Preston Sturges’s Miracle of Morgan’s Creek is a sequel to his The Great McGinty. “Miracle” takes place when McGinty is governor (as he was in the earlier film) and The Boss from “McGinty” is still his political boss. Brian Donlevy and Akim Tamiroff repeat their roles in both films.
The Duke Brothers from Trading Places make a brief appearance in Coming to America, connecting the two films.
I know there was a Sat Night Live skit that was quite similar- tho I don’t recall who was hosting (the host that night played Scrooge I think) & the whole thrust of the skit was that Scrooge was giving so much he was nearly bankrupt. There wasn’t nearly the depth of detail
Keith gives.
Keith Berry, you may be thinking of a December 1985 episode of the CBS anthology series George Burns Comedy Week titled “Christmas Carol II – The Sequel”, starring James Whitmore, Samantha Eggar, and Roddy McDowall.
Everybody knows that the first sequel to “Pink Panther” is “A Shot in the Dark” right?
You’ve got it backwards. **A Shot in the Dark was first a successful stage play. It was later filmed as the first "Inspector Clouseau film. The Pink Panther was the sequel. There were a lot of other sequels afterwards, all but one of them with “Pink Panther” in the title – even though they had nothing to do with the original Pink Panther (which was a gem).
I don’t think this really belongs here – people pretty much know about these sequels.
Extra Bonus Question: Who was the only person besides Peter Sellers to play Inspector Clouseau, and in which film? It’s not Roberto Begnini.
Alright, now I’m confused. I just checked out Peter Sellers on the IMDB, and it lists The Pink Panther before A Shot in the Dark:
http://us.imdb.com/Name?Sellers,+Peter
How did Inspector Clouseau get into a play before his first film came out? Or was he written into an existing play, taking over from a similar character? Or were the films released out of sequence? (They are both credited for 1964).
Aha! Here it is. My mistake:
The opening scene of The Lost World with the little girl being attacked by Compies is actually the first scene in the original book Jurassic Park. Other than that, there’s precious little relationship between the Lost World book and movie (besides the fact that both pretty much stunk up the joint.)
Ted Was, the guy who played Danny on Soap. Don’t recall the title of the movie though.
Roger Moore in Curse of the Pink Panther.
I’m sorry but it ain’t a Pink Panther movie without Sellers, and that blech-inducing Trail of the Pink Panther doesn’t count either.
Hey wait, who played Clouseau wrapped in bandages in that movie? That would be yet another actor who portrayed the Inspector, wouldn’t it?
Well, there was Alan Arkin in Inspector Clouseau (1968)
Roger Moore also played him (back shots, I guess) in the 1983 clip compilation, Curse of the Pink Panther, just after Sellers’ death.
Sorry, xizor, Ted Wass played Clifton Sleigh, who was searching for Clouseau in Curse of the Pink Panther. Interestingly, Richard Mulligan, who played Burt on Soap with Wass, played Clouseau’s father in the 1982 Trail of the Pink Panther.
Wasn’t The Wild Life, written by Cameron Crowe and starring Eric Stoltz and Chris Penn, the sequel to Fast Times at Ridgemont High?
Sublight has the answer I was looking for. Hadn’t heard about Roger Moore, but, then again, I never saw Curse. It’d have to be back shots to avoid confusing the audience.
Moore apparently played Clouseau after plastic surgery to make him look like – Roger Moore:
According to AMC, the play version didn’t have Inspector Clouseau, but Blake Edwards decided to add the successful Pink Panther character to the film version:
Wumpus – I provided that link about eight posts up.
Here’s another, I don’t know how well known – Ensign Pulver as a sequel to Mister Roberts.
Yes, but you didn’t explain it. 
Not really, (none of the same characters) but it was certainly marketed as if it were a true sequel. I remember one of the taglines being “Something faster…” Similarly, back in 1977, in the US ** Jabberwocky** was initially marketed as the sequel to ** Monty Python and the Holy Grail**, even though it isn’t even a Monty Python film.
My obscure literary sequel: as a kid I really liked ** After Worlds Collide**, the sequel to When Worlds Collide. There were plans to film it, but it never happened.
Many of my friends don’t realize Creature From the Black Lagoon has 2 sequels.